Calvin is located close to the center of Oklahoma. Calvin is between the Hughes, Coal county. Calvin has 0.49 square miles of land area and 0.00 square miles of water area. As of 2010-2014, the total Calvin population is 260, which has shrunk 6.81% since 2000. The population growth rate is much lower than the state average rate of 10.67% and is much lower than the national average rate of 11.61%. Calvin median household income is $27,083 in 2010-2014 and has grown by 33.04% since 2000. The income growth rate is lower than the state average rate of 38.43% and is higher than the national average rate of 27.36%. Calvin median house value is $62,300 in 2010-2014 and has grown by 149.20% since 2000. The house value growth rate is much higher than the state average rate of 62.66% and is much higher than the national average rate of 46.91%. As a reference, the national Consumer Price Index (CPI) inflation rate for the same period is 26.63%. On average, the public school district that covers Calvin is better than the state average in quality. The Calvin area codes are 405, 580.